Abstract: The present invention provides a dental ceramic coloring liquid with which a decrease in the mechanical strength of a dental ceramic after sintering can be reduced, and that can impart masking properties while having good preservation stability. The present invention relates to a dental ceramic coloring liquid comprising an organosilicon compound. The organosilicon compound is preferably hydrophilic. The organosilicon compound is preferably a silicone compound. The organosilicon compound is preferably an alkylsilane compound.

Abstract: An object of the present invention is to provide a dental composition that shows desirable adhesive properties to tooth structure, and that has desirable mechanical strength in the form of a cured product while having low polymerization shrinkage stress. The present invention relates to a dental composition comprising: a (meth)acrylic compound (A); a monomer (B) having an acidic group and a molecular weight of less than 5,000; a monomer (C) having no acidic group and having a molecular weight of less than 5,000; and a polymerization initiator (D), the (meth)acrylic compound (A) having an average molecular weight of 5,000 to 50,000, and an average molecular weight of 1,250 or more and less than 20,000 per (meth)acryl group.

Abstract: The present invention provides a dental ceramic coloring solution with which the desired shade can be imparted to a dental ceramic while improving the strength of the dental ceramic. The present invention relates to a coloring solution for coloring a dental ceramic, comprising a coloring component, a solvent, and a Zr component.

Abstract: The present invention provides a method of production of a zirconia sintered body by which a zirconia molded body or zirconia pre-sintered body having a plurality of layers containing different amounts of stabilizer is sintered in a short time period to produce a zirconia sintered body having hardly noticeable stripes between layers differing in yttria content. The present invention relates to a method for producing a zirconia sintered body, comprising a firing step of firing a zirconia molded body or a zirconia pre-sintered body, the zirconia molded body or the zirconia pre-sintered body comprising a plurality of layers containing a stabilizer, the plurality of layers including layers having different stabilizer contents, the firing step comprising at least three stages of temperature-increasing process including a first temperature-increasing step (H1), a second temperature-increasing step (H2), and a third temperature-increasing step (H3), the method satisfying HR2=more than 0° C.

Abstract: The present invention provides a dental curable composition that enables a highly aesthetic restoration that blends in so well with the surroundings that it is almost indistinguishable from natural teeth, and that, despite being a single dental curable composition, shows good color compatibility with natural teeth over a wide range of shades, particularly in cases involving cavity floors in different classes of cavities, such as Class I, Class II, and Class V The present invention relates to a dental curable composition comprising a polymerizable monomer (A), a filler (B), a polymerization initiator (C), and a colorant (D), wherein the ratios R650/600, R700/600, and R750/600 of spectral reflectances at 650 nm, 700 nm, and 750 nm wavelengths to a spectral reflectance at 600 nm wavelength all fall within a range of 97% to 103% when measured for a 1.0 mm-thick cured product of the dental curable composition against a white background with a spectral colorimeter.

Abstract: The present invention provides a to-be-processed body for dentistry for preparing a dental prosthesis that faithfully reproduces a natural tooth as though dentin is present underneath enamel and influencing appearance when seen from a close distance, without requiring a complex structure or a complicated manufacturing process.

Abstract: The present invention provides a dental ceramic coloring solution with which shades with the desired yellow tint can be imparted to a dental ceramic without causing fading, even when the dental ceramic colored with the coloring solution is baked after building up porcelain. The present invention relates to a coloring solution for coloring a dental ceramic, comprising a coloring component and a solvent, wherein the coloring component comprises a V component.

Abstract: The present invention provides a dental product comprising a base material formed of a zirconia sintered body, and having high aesthetic quality with enhanced fracture toughness and with reduced chipping and cracking in the porcelain layer. The present invention also provides a method for manufacturing such a dental product. The present invention relates to a dental product comprising: a base material formed of a zirconia sintered body, and a porcelain layer, wherein the porcelain of the porcelain layer has a suitable firing temperature of 900° C. or more, and the porcelain layer has a fracture toughness value of 1.20 MPa·m0.5 or more.

Abstract: The present invention provides a method for producing a powder containing zirconia particles and a fluorescent agent that enables easy production of a zirconia sintered body having both high translucency and high strength despite containing a fluorescent agent. The present invention relates to a method for producing a zirconia particle- and fluorescent agent-containing powder, comprising: a mixing step of mixing a zirconia particle-containing slurry and a liquid-state fluorescent agent; and a drying step of drying the slurry containing the zirconia particles and the fluorescent agent. Preferably, the fluorescent agent comprises a metallic element, and the powder comprises the fluorescent agent in an amount of 0.001 to 1 mass % in terms of an oxide of the metallic element relative to a mass of zirconia. Preferably, the zirconia particles have an average primary particle diameter of 30 nm or less. Preferably, the zirconia particles comprises 2.0 to 9.0 mol % yttria.

Abstract: The present invention provides a zirconia pre-sintered body that develops the preferable shade with a short firing time.

Abstract: The present invention provides a composition for dental attachments that exhibits excellent adhesive properties to uncut enamel without carrying out a pretreatment with, for example, a dental adhesive after etching with phosphoric acid or the like, and that has more than a certain level of mechanical characteristics, and enables a simplified bonding procedure for dental attachments. The present invention relates to a composition for dental attachments that comprises a polymerizable monomer (A), a photopolymerization initiator (B), and a filler (C), the polymerizable monomer (A) comprising a polymerizable monomer (A-1) having an acidic group, and a polymerizable monomer (A-2) having no acidic group, the content of the polymerizable monomer (A-1) having an acidic group being 1 to 40 parts by mass in total 100 parts by mass of the polymerizable monomer (A), the content of the filler (C) being 50 to 90 parts by mass in total 100 parts by mass of the composition.

Abstract: A zirconia molded body and a dental mill blank may decrease of the translucency of a zirconia sintered body upon firing even when the cooling solvent used for wet processing of the zirconia molded body or dental mill blank by a dental CAD/CAM system is contaminated. This can allow more convenient fabrication of a zirconia sintered body. A zirconia molded body may include zirconia; a stabilizer capable of inhibiting a phase transformation of zirconia; and a binder, and having an open porosity of 25% or less.

Abstract: The present invention provides a dental mill blank that exhibits desirable resistance against wear in opposing teeth. The present invention relates to a dental mill blank comprising: an inorganic filler containing an inorganic filler (A) and an inorganic filler (B); and a polymer, the inorganic filler (A) partly forming an aggregate, and the dental mill blank satisfying the following formulae (I) to (III), 0.001?a<0.32??(I) 0.3?b?10??(II) 5?x?80??(III), where a is an average primary particle diameter of the inorganic filler (A) in micrometers, b is an average primary particle diameter of the inorganic filler (B) in micrometers, and x is an average particle diameter of the aggregate in micrometers. Preferably, the dental mill blank comprises an island component containing the aggregate, and a sea component containing the inorganic filler (A) and the inorganic filler (B).

Abstract: The present invention provides an energy ray-curable coating material for three-dimensional shaped articles that provides excellent toughness in the cured product, and an energy ray-curable material kit for three-dimensional shaping including the coating material. The present invention relates to an energy ray-curable coating material (A) for three-dimensional shaped articles, comprising a polymerizable compound and a polymerization initiator (c), the polymerizable compound comprising a monofunctional polymerizable compound (a), and/or a polyfunctional polymerizable compound (b) having two or more polymerizable groups per molecule, the polyfunctional polymerizable compound (b) having a Mw/n of 120 or more, where Mw is a molecular weight of the polyfunctional polymerizable compound (b), and n is the number of polymerizable groups per molecule.

Abstract: The present invention provides a resin composition for optical shaping that, with its low viscosity, enables easy stereolithographical fabrication of an object, and that can produce an object having desirable toughness and desirable water resistance, particularly for dental mouthpieces and denture base materials. The present invention relates to a resin composition for optical shaping comprising a urethanized (meth)acrylic compound (A) and a photopolymerization initiator (B), the urethanized (meth)acrylic compound (A) being a (meth)acrylate containing at least one polyol moiety and a urethane bond per molecule, said at least one polyol moiety being selected from the group consisting of a polyester, a polycarbonate, a polyurethane, and a polyether each having a structure derived from a C4 to C18 aliphatic chain diol unit (a) having a branched structure.

Abstract: The present invention provides a resin composition for stereolithography that is easily shapable with good shape precision while reducing sedimentation of inorganic particles during storage, and a obtained three-dimensional shaped article thereby excels in mechanical characteristics such as flexural strength and flexural modulus, in addition to having a desirable shade and good shade stability. The present invention relates to a resin composition for stereolithography comprising a polymerizable monomer (a), a photopolymerization initiator (b), an inorganic particle (c) having an average particle diameter of 5 to 500 nm, and a hindered phenolic compound (d), wherein the content of the photopolymerization initiator (b) is 0.1 to 10 parts by mass relative to 100 parts by mass of the polymerizable monomer (a), the content of the inorganic particle (c) is 50 to 400 parts by mass relative to 100 parts by mass of the polymerizable monomer (a), and the content of the hindered phenolic compound (d) is 0.

Abstract: The present invention provides a resin composition for stereolithography that excels in strength, toughness, and water resistance in the form of a shaped article. The present invention relates to a resin composition for stereolithography that comprises a urethanized (meth)acrylic compound (A), a (meth)acrylate compound (B) containing no urethane bond, and a photopolymerization initiator (C), the compound (A) being a urethanized (meth)acrylic compound (A-1) having a polymer structure, and/or a urethanized (meth)acrylic compound (A-2) having no polymer structure, the compound (A-1) having a weight-average molecular weight of less than 1,000, the compound (A-2) having a molecular weight of less than 1,000, the compound (B) comprising at least one selected from the group consisting of a (meth)acrylate compound (b-I) represented by general formula (I), and a (meth)acrylate compound (b-II) represented by general formula (II).

Abstract: The present invention provides a dental composition that exhibits high adhesive property for both dental restoration materials, such as porcelain, and tooth structure. The present invention relates to a one-part dental composition comprising a compound (A) represented by the following general formula (1), a monomer (B) having an acidic group, and water (C), Y—SiRnX(3-n)??(1), wherein Y represents a monovalent organic group having a polymerizable group, R represents a group selected from the group consisting of an alkyl group, an aryl group, and an aralkyl group, X represents a hydroxyl group or a hydrolyzable group, and n represents an integer of 1 or 2, in which the plurality of R may be the same or different, and the plurality of X may be the same or different, and the content of the water (C) 1.0 to 50 mass %.

Abstract: A zirconia sintered body for dental use may not require coloring or firing after shaping, and have aesthetic properties. A preform may include a body and a stem. The body has a Vickers hardness of 4 to 20 HV (GPa), and is machinable. The stem has a width of 4 mm or less at a position where it protrudes from a central portion of the body. At this position, the central portion has a cross-sectional geometric shape with an inscribed circle having a diameter of >12 mm, and a circumscribed circle having a diameter of <20 mm. The body shows a color change from an upper to a lower end portion of the body, and unchanging patterns of increase and decrease of the L*a*b* color system values from the upper to the lower end portion. The preform can be shaped into a dental restoration such as a crown.